It had to happen sooner or later; have a sneak peek at
abyss Coil advanced Coil Abyss adv the new Coil dungeon.
Only screenshot available because my screen capture software decided it didn't like hotkeys and refused to work unless I alt-tabbed to directly tell it to.
This is an interesting new dungeon to say the least. There are a few things worth noting about this, that would also apply to Peaca Abyss. Firstly, it acts like a wild area and/or shadow mission rather than a dungeon. You can revive on the spot, like for Crumena's fight, so death is not a game over here even if you don't have Nao stones. As in other shadow missions, there is a chance that mobs will be stuck unable to move. Enemies are much tankier versions of mobs found in other parts of the world, but are generally weaker than most HM enemies.
Concerning Coil specifically, it only has three rooms, much larger than normal ones, with a few waves each (3 or 4 I am not sure). Each wave is randomized, so you might have an easy going or a terrible time depending on the
type of enemies number of giants sprites you have to face. Most enemies here multi aggro and do so faster and further than usual. In terms of damage, they are not much more dangerous than normal mobs, but that is not an excuse for taking a chaincasted ice spear or thunder in the face. Overall, the rooms can prove a decent challenge, but are quite manageable.
The boss on the other hand... it is a nightmare. It is extremely tanky, hits like a wooden log loaded truck and summon nasty stuff. Based on the damage and time it took me to kill it, I estimate its HP to something between 80,000 and 100,000 with about 35-40% protection. It only has three different attacks; a normal attack it mostly never uses that can hit for about 250-400 damage, a stomp-like attack that comes in three different version with varying range (yellow < green < red) that can do between 1-9999 damage (higher damage being more likely to happen the closer you are) and a very annoying attack that first roots you into place, doing 50 damage per second, and then draws you in doing another 150-300 damage. The third attack is the one most likely to get you killed and has an incredibly long range, about the same as a longbow. While rooted, you cannot move or uses skill, but you can (and should) drink potions. It has no passive defence, but does have advanced heavy stander, so no interruption of its skill is possible (except possible with sand burst).
Beating the dungeon give you a new title and, based on what is currently on the wiki, no good item whatsoever.